#2 Text node insert inside

[Tom Greenbaum]

Creating a second 'inside' text node appears to create
a second field. This is only temporary. Save, and
close then re-open and the 'two' text nodes are now
merged (contatenated) together into a single node.

Expected behavior: editor shouldn't allow a
second 'inside' text node.

[Marc Perroulaz]

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Pollo concatenate all text fields into one, you can see it
in the text view.
We have two solutions:
1) Determine characters to represent a field separator
(\f ?) and <enter> (\n ?).
2) Disable to insert another text node if there is already
one.

For the moment, non printable chars are converted to space.

Thanks to add more specification.